Been getting sudden pain in lower back then my legs almost feel numb and today i've had really bad abdominal pain accompanied by the back pain.

Complex symptoms: lower back pain plus abdominal pain can be caused by a wide variety of conditions - some are benign but others can be quite serious! Endometriosis can give back, abdo and leg pain - is there a relationship to your menstrual cycle? If any fever or malaise, do see a doctor right away for evaluation. Make sure it includes a urinalysis